Principal Investigator Product Integration Physically Impaired Performance Indicator Principal Investigators parameter identifier Payload Interrogator Program Improvement Personal Injury physical inventory position indicator Preliminary Injunction present illness Principle Investigator Program Introduction Proportional Integral Parallel Input Pen and Ink persistently infected Plasticity Index Presentation Indicator Pressure indicator Primary Infertility Priority Interrupt Professional Indemnity Program Indicator Program Information Programmed Instruction propidium iodide Protection Interval